I would be totally in as one of the freezers. I've been watching IE for a while now, and every time they come out with a new one I wish that I could live in NYC and participate in them (my favorites are the
cell phone symphony and the
MP3 experiment). This would be so awesome to be a part of.
My suggestion would be to do it either at the CNN court (as mentioned), or maybe at the courtyard between the pits/stadium. Doing it in the stadium would probably leave people in one of two situations: unnoticed (looks like someone fell asleep in the stands) or end up not doing it (frenzied in the pits or driving, others would probably not find it funny if you just froze all of a sudden).